From: Christopher Covington <cov@codeaurora.org>
To: Peter Hurley <peter@hurleysoftware.com>,
Russell King <linux@arm.linux.org.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Timur Tabi <timur@codeaurora.org>, Jon Masters <jcm@redhat.com>,
Mark Langsdorf <mlangsdo@redhat.com>,
Andre Przywara <andre.przywara@arm.com>,
Dave Martin <dave.martin@arm.com>,
Aleksey Makarov <aleksey.makarov@linaro.org>
Subject: Re: [PATCH v2] tty: amba-pl011: Use 32-bit accesses for SBSA UART
Date: Sat, 12 Mar 2016 06:38:44 +0700 [thread overview]
Message-ID: <34828481-F042-423A-BCE9-824AAFFA1A13@codeaurora.org> (raw)
In-Reply-To: <56E2DDF6.2000107@hurleysoftware.com>
On March 11, 2016 10:02:14 PM GMT+07:00, Peter Hurley <peter@hurleysoftware.com> wrote:
>Hi Christopher,
>
>On 03/10/2016 10:35 PM, Christopher Covington wrote:
>> Version 2 of the Server Base System Architecture (SBSAv2) describes
>the
>> Generic UART registers as 32 bits wide. At least one implementation,
>found
>> on the Qualcomm Technologies QDF2432, only supports 32 bit accesses.
>> SBSAv3, which describes supported access sizes in greater detail,
>> explicitly requires support for both 16 and 32 bit accesses to all
>> registers (and 8 bit accesses to some but not all). Therefore, for
>broad
>> compatibility, simply use 32 bit accessors for the SBSA UART.
>
>So this eliminates the need to configure SBSA port via ACPI, correct?
>Thus, Aleksey can drop his "serial: pl011: use SPCR to setup 32-bit
>access"?
Yes.
Thanks,
Christopher Covington
--
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
Sent from my Snapdragon powered Android device with K-9 Mail. Please excuse my brevity.
next prev parent reply other threads:[~2016-03-11 23:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 5:43 [PATCH] tty: amba-pl011: Use 32-bit accesses for SBSA UART Christopher Covington
2016-03-08 14:51 ` Mark Langsdorf
2016-03-11 6:35 ` Christopher Covington
2016-03-11 15:02 ` Peter Hurley
2016-03-11 23:38 ` Christopher Covington [this message]
2016-03-15 10:08 ` Andre Przywara
2016-03-30 12:30 ` Christopher Covington
2016-03-30 16:55 ` Greg Kroah-Hartman
2016-03-30 17:01 ` Timur Tabi
2016-03-30 18:01 ` Greg Kroah-Hartman
2016-03-30 18:11 ` Timur Tabi
2016-04-01 21:23 ` [PATCH v3] " Christopher Covington
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